package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.CategoryDTO;
import com.sky.dto.CategoryPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.exception.BaseException;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.CategoryMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.CategoryService;
import com.sky.utils.RedisDeleteKeysUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
 * 分类业务层
 */
@Service
@Slf4j
public class CategoryServiceImpl implements CategoryService {

    @Autowired
    private CategoryMapper categoryMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetMealMapper setmealMapper;
    //清除缓存
    @Autowired
    private RedisDeleteKeysUtil redisDeleteKeysUtil;

    /**
     * 新增分类
     * @param categoryDTO
     */
    public void save(CategoryDTO categoryDTO) {
        Category category = new Category();
        //属性拷贝
        BeanUtils.copyProperties(categoryDTO, category);
        //分类状态默认为禁用状态0
        category.setStatus(StatusConstant.DISABLE);
        categoryMapper.insert(category);
    }

    /**
     * 分页查询
     * @param categoryPageQueryDTO
     * @return
     */
    public PageResult pageQuery(CategoryPageQueryDTO categoryPageQueryDTO) {
        PageHelper.startPage(categoryPageQueryDTO.getPage(),categoryPageQueryDTO.getPageSize());
        //下一条sql进行分页，自动加入limit关键字分页
        Page<Category> page = categoryMapper.pageQuery(categoryPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 根据id删除分类
     * @param id
     */
    public void deleteById(Long id) {
        //查询当前分类是否关联了菜品，如果关联了就抛出业务异常
        List<Dish> listByCategoryIdResult = dishMapper.getListByCategoryId(id);
        if(!listByCategoryIdResult.isEmpty()){
            StringBuilder sb = new StringBuilder();
            for (Dish dish : listByCategoryIdResult) {
                sb.append(dish.getName()).append(",");
            }
            //当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH+"["+sb.toString()+"]");
        }
        //查询当前分类是否关联了套餐，如果关联了就抛出业务异常
        Integer count = setmealMapper.countByCategoryId(id);
        if(count > 0){
            //当前分类下有套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_SETMEAL);
        }

        //删除分类数据
        categoryMapper.deleteById(id);
        //清除缓存
        redisDeleteKeysUtil.deleteDishKey(id);
    }

    /**
     * 修改分类
     * @param categoryDTO
     */
    public void update(CategoryDTO categoryDTO) {
        Category category = new Category();
        BeanUtils.copyProperties(categoryDTO,category);
        categoryMapper.update(category);
        //清除缓存
        redisDeleteKeysUtil.deleteDishKey(categoryDTO.getId());
    }

    /**
     * 启用、禁用分类
     * @param status
     * @param id
     */
    @Transactional(rollbackFor = Exception.class)
    public void startOrStop(Integer status, Long id) {
        Category category = Category.builder()
                .id(id)
                .status(status)
                .build();
        int res = categoryMapper.update(category);
        if(res == StatusConstant.RETURN0){
            throw new BaseException(MessageConstant.UPDATE_FAILED);
        }
        //更新菜品状态
        dishMapper.updateStatusById(category);
        //清除缓存
        redisDeleteKeysUtil.deleteDishKey(id);
    }

    /**
     * 根据类型查询分类
     * @param type
     * @return
     */
    public List<Category> list(Integer type) {
        return categoryMapper.list(type);
    }
}
